CN112970304A

CN112970304A - Method for avoiding transmission collisions for NR V2X and LTE V2X within the same device

Info

Publication number: CN112970304A
Application number: CN201980070949.XA
Authority: CN
Inventors: T·V·恩古延; S·K·巴盖尔; K·古拉蒂
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2018-11-01
Filing date: 2019-10-31
Publication date: 2021-06-15
Anticipated expiration: 2039-10-31
Also published as: US20200146066A1; CN112970304B; EP3874852B9; WO2020092812A1; EP3874852B1; US11172508B2; EP3874852A1

Abstract

To improve performance of a User Equipment (UE) with V2X capabilities using two Radio Access Technologies (RATs), such as NR V2X and LTE V2X capabilities, a method is disclosed for a UE having first and second RAT components for allocating or adjusting resources for V2X transmissions using a first RAT and/or V2X transmissions using a second RAT to avoid or reduce potential collisions. The second RAT component may receive information from the first RAT component regarding the first resources for V2X transmissions using the first RAT. The second RAT component may determine whether there is a potential conflict between a first resource for a first transmission using the first RAT and a second resource for a second transmission using the second RAT. The second RAT component may change the second resource if there is a potential conflict. The first and second RAT components may transmit their respective V2X transmissions to the UEs.

Description

Method for avoiding transmission collisions for NR V2X and LTE V2X within the same device

Cross Reference to Related Applications

The present application claims the benefit of U.S. provisional application S/n.62/754,562 entitled "METHODS TO AND/or transmitting diversity colors FOR NR V2X AND LTE V2X WITHIN THE SAME DEVICE (METHODS FOR avoiding TRANSMISSION COLLISIONS FOR NR V2X AND LTE V2X within the same device)" filed on year 11/1 of 2018 AND U.S. patent application No.16/669,344 entitled "METHODS TO AND/or transmitting diversity colors FOR NR V2XAND LTE V2X WITHIN THE SAME DEVICE (METHODS FOR avoiding TRANSMISSION COLLISIONS FOR NR V2X AND LTE V2X within the same device)" filed on year 10/30 of 2019, both of which are expressly incorporated herein by reference in their entirety.

Background

Technical Field

The present disclosure relates generally to communication systems, and more particularly to wireless communication using two radio access technologies within the same device.

Introduction to the design reside in

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources. Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

These multiple access techniques have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate on a city, country, region, and even global level. An example telecommunication standard is the 5G New Radio (NR). The 5G NR is part of a continuous mobile broadband evolution promulgated by the third generation partnership project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the internet of things (IoT)), and other requirements. The 5G NR includes services associated with enhanced mobile broadband (eMBB), large-scale machine type communication (mtc), and ultra-reliable low latency communication (URLLC). Some aspects of the 5G NR may be based on the 4G Long Term Evolution (LTE) standard. Aspects of wireless communication may include direct communication between devices, such as in V2X, V2V, and/or D2D communication. There is a need for further improvements in the 5G NR, V2X, V2V, and/or D2D technologies. These improvements are also applicable to other multiple access techniques and telecommunications standards employing these techniques.

SUMMARY

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In an aspect of the disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus may have a first Radio Access Technology (RAT) component and a second RAT component. The apparatus may be a User Equipment (UE). The second RAT component may receive information from the first RAT component regarding first resources for a first transmission using the first RAT. The second RAT component may determine whether there is a potential conflict between a first resource for a first transmission using the first RAT and a second resource for a second transmission using the second RAT. The second RAT component may adjust the second transmission or change the second resource if there is a potential conflict. The second RAT component may transmit a second transmission to the second UE. The first RAT component may transmit the first transmission to the third UE.

In an aspect of the disclosure, an apparatus for communicating using a first RAT may schedule a first resource for a UE to use the first RAT for a first transmission. The apparatus may be a base station. The apparatus may receive, from a UE, information regarding second resources reserved for a second transmission from the UE using a second RAT. The apparatus may determine a first resource for a first transmission using a first RAT to avoid using a second resource reserved for a second transmission using a second RAT. The apparatus may transmit information about the first resource to the UE.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the present description is intended to include all such aspects and their equivalents.

Brief Description of Drawings

Fig. 1 is a diagram illustrating an example of a wireless communication system and an access network.

Fig. 2A, 2B, 2C, and 2D are diagrams illustrating examples of DL channels within a first 5G/NR frame, a 5G/NR subframe, a second 5G/NR frame, and UL channels within the 5G/NR subframe, respectively.

Fig. 3 is a diagram illustrating an example of a base station and a User Equipment (UE) in an access network.

Fig. 4 is a call flow diagram illustrating an implementation of an NR component of a UE operating in an NR V2X autonomous transmission (Tx) mode exchanging information about transmission resources with an LTE component of the same UE operating in an LTE V2X autonomous transmission mode, in accordance with certain aspects of the present disclosure.

Fig. 5 is a call flow diagram illustrating an implementation in which an NR component of a UE operating in an NR V2X autonomous transmission mode exchanges information about transmission resources with an LTE component of the same UE operating in an LTE V2X mode in which an LTE base station schedules LTE V2X transmissions, in accordance with certain aspects of the present disclosure.

Fig. 6 is a call flow diagram illustrating an implementation of an NR component of a UE operating in an NR V2X mode in which an NR base station schedules NR V2X transmissions to exchange information about transmission resources with an LTE component of the same UE operating in an LTE V2X autonomous transmission mode, in accordance with certain aspects of the present disclosure.

Fig. 7 is a call flow diagram illustrating an implementation of an NR component of a UE operating in an NR V2X mode in which an NR base station schedules NR V2X transmissions exchanging information about transmission resources with an LTE component of the same UE operating in an LTE V2X mode in which an LTE base station schedules LTE V2X transmissions, in accordance with certain aspects of the present disclosure.

Fig. 8 is a flow diagram of a method for a second RAT component of a UE to avoid collisions on transmissions using a second RAT based on information received from a first RAT component of the UE regarding resources for transmissions using a first RAT in accordance with certain aspects of the present disclosure.

Fig. 9 is a flow diagram of a method for a first RAT component of a UE to exchange information regarding transmission resources with a second RAT component of the UE and to transmit information regarding resources for transmissions using a second RAT to a base station of the first RAT in accordance with certain aspects of the present disclosure.

Fig. 10 is a conceptual data flow diagram illustrating data flow between different means/components in an example apparatus of a UE communicating using two RATs according to certain aspects of the present disclosure.

Fig. 11 is a diagram illustrating an example of a hardware implementation of a device employing a UE of a processing system in accordance with certain aspects of the present disclosure.

Fig. 12 is a flow diagram of a method for a base station of a first RAT to receive information from a UE regarding resources reserved for transmissions from the UE using a second RAT to determine resources for transmissions from the UE using the first RAT in accordance with certain aspects of the present disclosure.

Fig. 13 is a conceptual data flow diagram illustrating the data flow between different means/components in an example apparatus of a base station according to certain aspects of the present disclosure.

Fig. 14 is a diagram illustrating an example of a hardware implementation of an apparatus employing a base station of a processing system in accordance with certain aspects of the present disclosure.

Fig. 15 is a diagram 1500 illustrating an example of a slot structure that may be used for sidelink communications in accordance with certain aspects of the present disclosure.

Detailed Description

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details to provide a thorough understanding of the various concepts. It will be apparent, however, to one skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Several aspects of a telecommunications system will now be presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and are illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

As an example, an element, or any portion of an element, or any combination of elements, may be implemented as a "processing system" that includes one or more processors. Examples of processors include: a microprocessor, a microcontroller, a Graphics Processing Unit (GPU), a Central Processing Unit (CPU), an application processor, a Digital Signal Processor (DSP), a Reduced Instruction Set Computing (RISC) processor, a system-on-chip (SoC), a baseband processor, a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a state machine, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. One or more processors in the processing system may execute software. Software should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subprograms, software components, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to in software, firmware, middleware, microcode, hardware description language, or other terminology.

Accordingly, in one or more examples, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored or encoded as one or more instructions or code on a computer-readable medium. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise Random Access Memory (RAM), Read Only Memory (ROM), electrically erasable programmable ROM (eeprom), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the above types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

Fig. 1 is a diagram illustrating an example of a wireless communication system and an access network 100. A wireless communication system, also referred to as a Wireless Wide Area Network (WWAN), includes a base station 102, a UE104, an Evolved Packet Core (EPC)160, and a core network (e.g., 5GC) 190. Base station 102 may include macro cells (high power cellular base stations) and/or small cells (low power cellular base stations). The macro cell includes a base station. Small cells include femtocells, picocells, and microcells.

A base station 102 configured for 4G LTE, collectively referred to as an evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access network (E-UTRAN), may interface with the EPC 160 through a backhaul link 132 (e.g., an S1 interface). Base stations 102 configured for NR, collectively referred to as next generation RAN (NG-RAN), may interface with core network 190 over backhaul links 184. Among other functions, the base station 102 may perform one or more of the following functions: communication of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, Radio Access Network (RAN) sharing, Multimedia Broadcast Multicast Service (MBMS), subscriber and equipment tracking, RAN Information Management (RIM), paging, positioning, and delivery of alert messages. The base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC 160 or the core network 190) over a backhaul link 134 (e.g., an X2 interface). The backhaul link 134 may be wired or wireless.

The base station 102 may communicate wirelessly with the UE 104. Each base station 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102 'may have a coverage area 110' that overlaps with the coverage areas 110 of one or more macro base stations 102. A network that includes both small cells and macro cells may be referred to as a heterogeneous network. The heterogeneous network may also include a home evolved node B (eNB) (HeNB), which may provide services to a restricted group referred to as a Closed Subscriber Group (CSG). The communication link 120 between base station 102 and UE104 may include Uplink (UL) (also known as reverse link) transmissions from UE104 to base station 102 and/or Downlink (DL) (also known as forward link) transmissions from base station 102 to UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna techniques including spatial multiplexing, beamforming, and/or transmit diversity. These communication links may be over one or more carriers. For each carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) for transmission in each direction, the base station 102/UE 104 may use a spectrum of up to a Y MHz (e.g., 5, 10, 15, 20, 100, 400MHz, etc.) bandwidth. These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL than UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL/UL WWAN spectrum. D2D communication link 158 may use one or more sidelink channels such as a Physical Sidelink Broadcast Channel (PSBCH), a Physical Sidelink Discovery Channel (PSDCH), a Physical Sidelink Shared Channel (PSSCH), and a Physical Sidelink Control Channel (PSCCH). The D2D communication may be over a variety of wireless D2D communication systems such as, for example, FlashLinQ, WiMedia, bluetooth, ZigBee, Wi-Fi based on IEEE 802.11 standards, LTE, or NR.

The wireless communication system may further include a Wi-Fi Access Point (AP)150 in communication with a Wi-Fi Station (STA)152 via a communication link 154 in a 5GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152/AP 150 may perform a Clear Channel Assessment (CCA) prior to the communication in order to determine whether the channel is available.

The small cell 102' may operate in licensed and/or unlicensed spectrum. When operating in unlicensed spectrum, the small cell 102' may employ NR and use the same 5GHz unlicensed spectrum as used by the Wi-Fi AP 150. A small cell 102' employing NR in the unlicensed spectrum may boost the coverage of the access network and/or increase the capacity of the access network.

Whether a small cell 102' or a large cell (e.g., a macro base station), the base station 102 may include an eNB, g B node (gNB), or other type of base station. Some base stations 180, such as a gNB, may operate in a conventional sub-6 GHz spectrum, millimeter wave (mmW) frequencies, and/or near mmW frequencies to communicate with the UE 104. When the gbb operates in mmW or near mmW frequencies, the gbb may be referred to as a mmW base station. Extremely High Frequencies (EHF) are part of the RF in the electromagnetic spectrum. The EHF has a range of 30GHz to 300GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this frequency band may be referred to as millimeter waves. Near mmW can be extended down to 3GHz frequencies with 100 mm wavelength. The ultra-high frequency (SHF) band extends between 3GHz to 30GHz, which is also known as a centimeter wave. Communications using the mmW/near mmW radio frequency band have extremely high path loss and short range. The base station 180 (e.g., mmW base station) may utilize beamforming 182 with the UE104 to compensate for very high path loss and short range.

Devices may transmit and receive communications using beamforming. For example, fig. 1 illustrates that the base station 180 may transmit a beamformed signal to the UE104 in one or more transmit directions 182'. The UE104 may receive beamformed signals from the base station 180 in one or more receive directions 182 ". The UE104 may also transmit beamformed signals to the base station 180 in one or more transmit directions. The base station 180 may receive beamformed signals from the UEs 104 in one or more receive directions. The base station 180/UE 104 may perform beam training to determine the best receive direction and transmit direction for each of the base station 180/UE 104. The transmit direction and the receive direction of the base station 180 may be the same or may be different. The transmit direction and the receive direction of the UE104 may be the same or may be different. Although beamformed signals are illustrated between the UE104 and the base station 102/180, aspects of beamforming may be similarly applied by the UE104 or RSU 107 to communicate with another UE104 or RSU 107, such as based on V2X, V2V, or D2D communications.

The EPC 160 may include a Mobility Management Entity (MME)162, other MMEs 164, a serving gateway 166, a Multimedia Broadcast Multicast Service (MBMS) gateway 168, a broadcast multicast service center (BM-SC)170, and a Packet Data Network (PDN) gateway 172. MME 162 may be in communication with Home Subscriber Server (HSS) 174. MME 162 is a control node that handles signaling between UE104 and EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets pass through the serving gateway 166, which serving gateway 166 itself connects to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation as well as other functions. The PDN gateway 172 and BM-SC 170 are connected to an IP service 176. IP services 176 may include the internet, intranets, IP Multimedia Subsystem (IMS), PS streaming services, and/or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may be used as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and may be used to schedule MBMS transmissions. The MBMS gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service and may be responsible for session management (start/stop) and for collecting eMBMS-related charging information.

The core network 190 may include an access and mobility management function (AMF)192, other AMFs 193, a Session Management Function (SMF)194, and a User Plane Function (UPF) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE104 and the core network 190. In general, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets pass through the UPF 195. The UPF 195 provides UE IP address assignment as well as other functions. The UPF 195 is connected to the IP service 197. The IP services 197 may include the internet, intranets, IP Multimedia Subsystem (IMS), PS streaming services, and/or other IP services.

A base station may also be called a gbb, a node B, an evolved node B (eNB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a Transmission Reception Point (TRP), or some other suitable terminology. Base station 102 provides an access point for UE104 to EPC 160 or core network 190. Examples of UEs 104 include cellular phones, smart phones, Session Initiation Protocol (SIP) phones, laptops, Personal Digital Assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablets, smart devices, wearable devices, vehicles, electricity meters, gas pumps, large or small kitchen appliances, healthcare devices, implants, sensors/actuators, displays, or any other similar functioning device. Some UEs 104 may be referred to as IoT devices (e.g., parking meters, oil pumps, ovens, vehicles, heart monitors, etc.). UE104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

Some wireless communication networks may include vehicle-based communication devices that may communicate and/or communicate with other devices from a vehicle-to-vehicle (V2V), a vehicle-to-infrastructure (V2I) (e.g., from a vehicle-based communication device to a road infrastructure node, such as a Road Side Unit (RSU)), a vehicle-to-network (V2N) (e.g., from a vehicle-based communication device to one or more network nodes, such as base stations), and/or combinations thereof, which may be collectively referred to as vehicle networking (V2X) communications. Referring again to fig. 1, in certain aspects, a UE104 (e.g., a transmitting Vehicle User Equipment (VUE) or other UE) may be configured to transmit a message directly to another UE 104. The communication may be based on V2V/V2X/V2I or other D2D communications, such as proximity services (ProSe), and the like. Communications based on V2V, V2X, V2I, and/or D2D may also be transmitted and received by other transmitting and receiving devices, such as Road Side Units (RSUs) 107, etc. Aspects of the communication may be based on PC5 or sidelink communication, for example, as described in connection with the example in fig. 15. Although the following description may provide examples for V2X/D2D communication in conjunction with LTE and 5G NR, the concepts described herein may be applicable to other similar fields, such as LTE-a, CDMA, GSM, and other wireless technologies.

It is desirable for 5G NR technology to facilitate autonomous vehicles by enabling inter-vehicle (V2V) communications as well as other types of vehicle communications, such as vehicle-to-network (V2N), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), etc., all of which may be broadly categorized as internet-of-vehicles (V2X) communications. An apparatus (such as a UE 104) may perform V2X communication with one device using NR techniques and may perform V2X communication with another device using LTE techniques. When NR V2X capability coexists with LTE V2X capability within the same UE, a collision may occur between V2X transmissions using NR and V2X transmissions using LTE technology. Collisions between NR V2X transmissions and LTE V2X transmissions may degrade performance, such as reducing communication throughput, range, or both.

Referring again to fig. 1, in certain aspects, an apparatus (such as a UE104 or a base station 108) may be configured to avoid or minimize collisions between NR V2X transmissions and LTE V2X transmissions. The apparatus may include a dual Radio Access Technology (RAT) V2X transmission avoidance component 198 in the UE104 or the base station 180 that may be configured to receive information regarding resources reserved for a first RAT and allocate resources for a second RAT to avoid transmission collisions between the first RAT and the second RAT. In one example, the first RAT may be LTE and the second RAT may be NR. In this example, dual RAT V2X transmission avoidance component 198 may receive information regarding resources reserved for LTE V2X transmissions. The dual-RAT V2X transmission avoidance component 198 may allocate or adjust resources for NR V2X transmissions based on resources reserved for LTE V2X transmissions to avoid collisions between NR V2X transmissions and LTE V2X transmissions. In an aspect, LTE V2X transmissions may be given higher priority than NR V2X transmissions. In an aspect, in autonomous mode, the UE104 may allocate resources for NR V2X transmissions and LTE V2X transmissions without assistance from a base station to avoid collisions. In an aspect, a base station of a first RAT (such as base station 180) may receive information from the UE104 regarding resources reserved for V2X transmissions using a second RAT, and may allocate or adjust resources for V2X transmissions using the first RAT by the UE104 to avoid collisions. The base station may transmit information to the UE104 regarding the resources allocated for V2X transmissions using the first RAT. Although the examples are described in connection with V2X communications, aspects may also be applied to V2V or other D2D communications.

Fig. 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure. Fig. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe. Fig. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure. Fig. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe. The 5G/NR frame structure may be FDD, where for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to either DL or UL; or may be TDD, where for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to both DL and UL. In the example provided by fig. 2A, 2C, the 5G/NR frame structure is assumed to be TDD, with subframe 4 configured with slot format 28 (mostly DL) and subframe 3 configured with slot format 34 (mostly UL), where D is DL, U is UL, and X is for flexible use between DL/UL. Although

subframes

3, 4 are shown as having slot formats 34, 28, respectively, any particular subframe may be configured with any of a variety of available slot formats 0-61. Slot formats 0, 1 are full DL, full UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. The UE is configured with a slot format (dynamically configured through DL Control Information (DCI) or semi-statically/statically configured through Radio Resource Control (RRC) signaling) through a received Slot Format Indicator (SFI). Note that the following description also applies to a 5G/NR frame structure which is TDD.

Other wireless communication technologies may have different frame structures and/or different channels. One frame (10ms) can be divided into 10 equally sized sub-frames (1 ms). Each subframe may include one or more slots. A subframe may also include a mini-slot, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on the DL may be Cyclic Prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or Discrete Fourier Transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to single stream transmission). The number of slots within a subframe is based on the slot configuration and parameter design. For slot configuration 0, different parameter designs μ 0 to 5 allow 1, 2, 4, 8, 16 and 32 slots per subframe, respectively. For slot configuration 1, different parameter designs 0 to 2 allow 2, 4 and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and parameter design μ, there are 14 symbols per slot and 2 per subframe^μAnd a time slot. The subcarrier spacing and symbol length/duration are a function of the parameter design.

The subcarrier spacing may be equal to 2^μ15kHz, where μ is parametric 0 to 5.

Thus, the parametric design μ -0 has a subcarrier spacing of 15kHz, while the parametric design μ -5 has a subcarrier spacing of 480 kHz. The symbol length/duration is inversely related to the subcarrier spacing. Fig. 2A-2D provide an example of a slot configuration 0 with 14 symbols per slot and a parametric design μ ═ 0 with 1 slot per subframe. The subcarrier spacing is 15kHz and the symbol duration is about 66.7 mus.

A resource grid may be used to represent the frame structure. Each slot includes Resource Blocks (RBs) (also referred to as physical RBs (prbs)) extending 12 consecutive subcarriers. The resource grid is divided into a plurality of Resource Elements (REs). The number of bits carried by each RE depends on the modulation scheme.

As illustrated in fig. 2A, some REs carry reference (pilot) signals (RSs) for the UE. The RS may include a demodulation RS (DM-RS) (indicated as R for one particular configuration) for channel estimation at the UE_xWhere 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS). The RS may also include a beam measurement RS (BRS), a Beam Refinement RS (BRRS), and a phase tracking RS (PT-RS).

Fig. 2B illustrates an example of various DL channels within a subframe of a frame. A Physical Downlink Control Channel (PDCCH) carries DCI within one or more Control Channel Elements (CCEs), each CCE includes 9 RE groups (REGs), each REG including 4 consecutive REs in an OFDM symbol. The Primary Synchronization Signal (PSS) may be within symbol 2 of a particular subframe of the frame. The PSS is used by the UE104 to determine subframe/symbol timing and physical layer identity. A Secondary Synchronization Signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE may determine a Physical Cell Identifier (PCI). Based on the PCI, the UE may determine the location of the aforementioned DM-RS. A Physical Broadcast Channel (PBCH) carrying a Master Information Block (MIB) may be logically grouped with a PSS and a SSS to form a Synchronization Signal (SS)/PBCH block. The MIB provides the number of RBs in the system bandwidth, and the System Frame Number (SFN). The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information, such as System Information Blocks (SIBs), which are not transmitted through the PBCH, and a paging message.

As illustrated in fig. 2C, some REs carry DM-RS for channel estimation at the base station (indicated as R for one particular configuration, but other DM-RS configurations are possible). The UE may transmit the DM-RS for a Physical Uplink Control Channel (PUCCH) and the DM-RS for a Physical Uplink Shared Channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is transmitted and depending on the particular PUCCH format used. Although not shown, the UE may transmit a Sounding Reference Signal (SRS). The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

Fig. 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries Uplink Control Information (UCI) such as scheduling request, Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), and HARQ ACK/NACK feedback. The PUSCH carries data and may additionally be used to carry Buffer Status Reports (BSRs), Power Headroom Reports (PHR), and/or UCI.

Fig. 15 illustrates example diagrams 1500 and 1510 illustrating example slot structures that may be used for wireless communication between UE104 and UE 104' (e.g., for side-link communication). The slot structure may be within a 5G/NR frame structure. Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar fields, such as LTE, LTE-a, CDMA, GSM, and other wireless technologies. This is merely an example, and other wireless communication technologies may have different frame structures and/or different channels. One frame (10ms) can be divided into 10 equally sized sub-frames (1 ms). Each subframe may include one or more slots. A subframe may also include a mini-slot, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. Diagram 1500 illustrates a single slot transmission, which may correspond to a 0.5ms Transmission Time Interval (TTI), for example. Diagram 1510 illustrates example 2 slot aggregation, e.g., aggregation of two 0.5ms TTIs. Diagram 1500 illustrates a single RB, while diagram 1510 illustrates N RBs. In diagram 1510, 10 RBs for control are just one example. The number of RBs may be different.

A resource grid may be used to represent the frame structure. Each slot may include Resource Blocks (RBs) (also referred to as physical RBs (prbs)) that extend 12 consecutive subcarriers. The resource grid is divided into a plurality of Resource Elements (REs). The number of bits carried by each RE depends on the modulation scheme. As illustrated in fig. 15, some REs may include control information, e.g., along with demodulation rs (dmrs). Fig. 15 also illustrates that the symbol(s) may include CSI-RS. The symbols dedicated to DMRS or CSI-RS in fig. 15 indicate that the symbols include DMRS or CSI-RS REs. Such symbols may also include REs that contain data. For example, if the number of ports of the DMRS or CSI-RS is 1 and a comb-2 (comb-2) pattern is used for the DMRS/CSI-RS, half of the REs may include the RS and the other half of the REs may include data. The CSI-RS resource may start at any symbol of the slot and may occupy 1, 2 or 4 symbols, depending on the number of ports configured. The CSI-RS may be periodic, semi-persistent, or aperiodic (e.g., based on DCI triggers). For time/frequency tracking, the CSI-RS may be periodic or aperiodic. The CSI-RS may be transmitted in bursts of two or four symbols spread across one or two slots. The control information may include Sidelink Control Information (SCI). At least one symbol may be used for feedback, as described herein. Symbols before and/or after feedback may be used to turnaround between data reception and feedback transmission. Although symbol 12 is illustrated for data, it may instead be a gap symbol to enable turnaround for feedback in symbol 13. Another symbol (e.g., at the end of the slot) may be used as a gap. The gap enables the device to switch (e.g., in a subsequent time slot) from operating as a transmitting device to being ready to operate as a receiving device. As illustrated, data may be transmitted in the remaining REs. The data may include data messages as described herein. The location of any of the SCI, feedback, and LBT symbols may be different from the example illustrated in fig. 15. Multiple time slots may be grouped together. Fig. 15 also illustrates an example aggregation of two slots. The number of aggregated slots may also be greater than two. When the slots are aggregated, the symbols and/or gap symbols for feedback may be different from the symbols and/or gap symbols for feedback for a single slot. Although feedback is not illustrated for this aggregation example, symbol(s) in a multi-slot aggregation may also be allocated for feedback, as illustrated in one slot example.

Fig. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from EPC 160 may be provided to controller/processor 375. The controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a Radio Resource Control (RRC) layer, and layer 2 includes a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Medium Access Control (MAC) layer. The controller/processor 375 provides RRC layer functionality associated with broadcast of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration of UE measurement reports; PDCP layer functionality associated with header compression/decompression, security (ciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with delivery of upper layer Packet Data Units (PDUs), error correction by ARQ, concatenation, segmentation and reassembly of RLC Service Data Units (SDUs), re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto Transport Blocks (TBs), demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction by HARQ, priority handling, and logical channel prioritization.

The Transmit (TX) processor 316 and the Receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes the Physical (PHY) layer, may include error detection on the transport channel, Forward Error Correction (FEC) encoding/decoding of the transport channel, interleaving, rate matching, mapping onto the physical channel, modulation/demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 processes the mapping to the signal constellation based on various modulation schemes (e.g., Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to OFDM subcarriers, multiplexed with reference signals (e.g., pilots) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to generate a physical channel carrying a time-domain OFDM symbol stream. The OFDM stream is spatially precoded to produce a plurality of spatial streams. The channel estimates from channel estimator 374 may be used to determine coding and modulation schemes and for spatial processing. The channel estimate may be derived from a reference signal transmitted by the UE 350 and/or channel condition feedback. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318 TX. Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.

At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to a Receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined into a single OFDM symbol stream by the RX processor 356. RX processor 356 then transforms the OFDM symbol stream from the time domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, as well as the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. These data and control signals are then provided to a controller/processor 359 that implements layer 3 and layer 2 functionality.

The controller/processor 359 can be associated with memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, cipher interpretation, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 359 is also responsible for error detection using ACK and/or NACK protocols to support HARQ operations.

Similar to the functionality described in connection with the DL transmission by base station 310, controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction by ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction by HARQ, priority handling, and logical channel prioritization.

Channel estimates, derived by a channel estimator 358 from reference signals or feedback transmitted by base station 310, may be used by TX processor 368 to select appropriate coding and modulation schemes, as well as to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354 TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

UL transmissions are processed at the base station 310 in a manner similar to that described in connection with receiver functionality at the UE 350. Each receiver 318RX receives a signal through its corresponding antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to RX processor 370.

The controller/processor 375 can be associated with a memory 376 that stores program codes and data. Memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, cipher interpretation, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from controller/processor 375 may be provided to EPC 160. The controller/processor 375 is also responsible for error detection using ACK and/or NACK protocols to support HARQ operations.

At least one of TX processor 368, RX processor 356, and controller/processor 359 may be configured to perform aspects in combination with 198 of fig. 1.

At least one of TX processor 316, RX processor 370, and controller/processor 375 may be configured to perform aspects in combination with 198 of fig. 1.

The UE may have capabilities for multi-RAT based V2X communication. For example, the UE may be capable of communicating based on NR V2X and based on LTE V2X. As an example, when a UE has NR V2X capability along with LTE V2X capability, a collision may occur between NR-based V2X transmissions and LTE technology-based V2X transmissions. Such collisions between V2X transmissions for different RATs (e.g., NR V2X transmissions and LTE V2X transmissions) may degrade the performance of the UE, such as reducing communication throughput and/or range. For example, two V2X transmission components may share the same RF chain. Even if two V2X transmission components for different RATs operate in different frequency channels, the same power amplifier sharing an RF chain may introduce intermodulation products and power back-off issues between transmissions on the two frequency channels. To reduce the likelihood of intermodulation between the two transmissions, power back-off may be used. However, power back-off reduces the transmission range. Power sharing between two colliding transmissions may also require a reduction in transmission power per transmission, which also reduces communication range and/or data throughput. To improve performance, the UE and/or base station may allocate or adjust transmission resources for transmissions or for NR V2X transmissions and/or LTE V2X transmissions to avoid or reduce potential collisions.

The UE performing V2X communication may operate in an autonomous mode or may be assisted by a base station. In autonomous mode, the UE may allocate resources for V2X transmissions without relying on a base station. In the base station assisted mode, the base station may allocate resources for the UE for V2X transmissions. For example, in LTE V2X autonomous mode (e.g., LTE mode 4), the UE may allocate resources for LTE V2X transmissions. In LTE V2X base station assisted mode (e.g., LTE mode 3), an LTE base station (such as an eNB) may allocate resources for LTE V2X transmissions by a UE. Similarly, in NR V2X autonomous mode (e.g., NR mode 2), the UE may allocate resources for NR V2X transmissions. In an NR V2X base station assisted mode (e.g., NR mode 1), an NR base station (such as a gNB) may allocate resources for NR V2X transmissions by a UE. The LTE/NR mode of operation for the UE may be independently selected. As such, the UE may perform LTE V2X transmissions and NR V2X transmissions in four possible mode combinations. For ease of discussion, the portion of the UE performing LTE V2X transmissions may be referred to as an LTE component, and the portion of the UE performing NR V2X transmissions may be referred to as an NR component.

Fig. 4 is a call flow diagram 400 illustrating an implementation of the NR component 408 of a UE 402 operating in an NR V2X autonomous mode (e.g., NR mode 2) exchanging information about transmission resources with the LTE component 406 of the same UE operating in an LTE V2X autonomous mode (e.g., LTE mode 4), in accordance with certain aspects of the present disclosure. Although the example aspects are described in connection with LTE V2X communications and NR V2X communications, the aspects may also be applied to V2X, V2V, or D2D communications based on first and second RATs.

At 406, the LTE component 406 operating in LTE V2X autonomous mode may schedule transmission resources for LTE V2X communication. The resources may be in time and/or frequency. In an aspect, the LTE component may schedule resources for V2X transmissions in a special mode. For example, the LTE component may reserve semi-persistent scheduling (SPS) resources for LTE V2X communications. The LTE component may reserve SPS resources for LTE V2X transmissions until the SPS resources are adjusted due to the resource reselection procedure. In an aspect, the resource may be periodic. For example, one subframe may be reserved for LTE V2X transmissions every N subframes, where N is the periodicity in the subframes of SPS resources. In an aspect, the LTE component may schedule one or more resources (e.g., one-shot resources) on a once-only basis. At 410, the LTE component may communicate information regarding scheduled resources for LTE V2X transmissions to the NR component. In an aspect, an LTE component may communicate with an NR component using inter-stack communication by passing information from an LTE V2X stack to an NR V2X stack.

The NR component 408 operating in the NR V2X autonomous mode may schedule transmission resources for NR V2X communications. These resources may be reserved as one-time resources or SPS resources for NR V2X transmissions. For reasons of backward compatibility, and because LTE V2X may serve basic security applications, if there is a conflict in the scheduled resources for LTE V2X transmissions and NR V2X transmissions, priority may be given to LTE V2X transmissions. Thus, at 418, the NR component may use the information, e.g., 410, to schedule or adjust NR V2X transmission resources to avoid using LTE V2X transmission resources. For example, if there is a periodic collision between the resources for NR V2X transmissions and the resources for LTE V2X transmissions, the NR component may reselect the NR V2X resources. The NR component 408 may also schedule or adjust NR V2X transmission resources based on the

information

412 and 414 received from the LTE component 406 to avoid using LTE V2X transmission resources, as discussed below.

On the other hand, for a type of traffic in NR V2X that has very high priority, stringent delay requirements, or both, priority may be given to the NR V2X transmission. As one example, a high priority resource for NR V2X that conflicts with LTE V2X resources may trigger resource reselection at LTE V2X component 406. Accordingly, in one aspect, at 416, the NR component 408 may communicate information to the LTE component regarding the high priority resources for NR V2X transmissions such that the LTE component may reselect resources. Alternatively, if the NR component reselects resources due to a collision (at 418), the NR component may communicate information about the reselected resources for NR V2X transmission to the LTE component at 420. In an aspect, the NR component may communicate with the LTE component by passing information from the NR V2X stack to the LTE V2X stack.

LTE component 406 may receive information regarding the high priority resources reserved for NR V2X transmissions at 416 and may trigger reselection of LTE V2X transmission resources if there is a conflict between the NR V2X transmission high priority resources and the scheduled LTE V2X transmission resources. At 412, the LTE component may communicate information regarding reselected resources for LTE V2X transmissions to the NR component. At 418, the NR component may use the information, e.g., 412, to schedule or adjust NR V2X transmission resources to avoid using LTE V2X transmission resources.

Due to the latency of communicating information from the LTE stack of LTE component 406 to the NR stack of NR component 408, there may be periods of time when the NR component is not fully aware of the scheduled LTE V2X transmission. For example, if the communication latency is x milliseconds, and if the LTE component reschedules the earliest LTE V2X transmission to use a resource that is less than x milliseconds in distance, the first LTE V2X transmission has occurred by the time the NR component receives information from the LTE component regarding the scheduled resource for LTE V2X transmissions. If there is an NR V2X transmission using the same resource, there may be a collision. In an aspect, when the NR component detects a collision, the NR component may terminate the NR V2X transmission to give priority to the LTE V2X transmission. In an aspect, the NR component may adjust the transmit power of the NR V2X transmission. In an aspect, the LTE component may adjust the transmit power of LTE V2X transmissions. In one aspect, at 422, the NR component may communicate information regarding potential or actual conflicts to the LTE component. The LTE component may change the scheduled resources for LTE V2X transmissions if there is a potential conflict, or may take measures to mitigate performance loss if there is an actual conflict.

To minimize the likelihood of collisions, at 414, LTE component 406 may communicate information to NR component 408 regarding potential resources that may be selected by the LTE component for LTE V2X transmissions. The NR component may avoid using these potential resources for NR V2X transmissions. Thus, even though the NR component may not know whether one or more potential resources have actually been selected for LTE V2X transmissions, the NR component may reduce the likelihood of collisions by refraining from using the potential resources for NR V2X transmissions until other resources are exhausted.

Fig. 5 is a call flow diagram 500 illustrating an implementation of an NR component 508 of a UE operating in an NR V2X autonomous mode (e.g., NR mode 2) exchanging information about transmission resources with an LTE component 506 of the same UE operating in an LTE V2X mode (e.g., LTE mode 3) where the first base station 504 schedules LTE V2X transmissions, in accordance with certain aspects of the present disclosure. Although the example aspects are described in connection with LTE V2X communications and NR V2X communications, the aspects may also be applied to V2V or D2D communications based on first and second RATs.

A first base station 504, such as an LTE base station (e.g., eNB), may schedule transmission resources for LTE V2X communication using a first RAT. The resources may be SPS resources or dynamic resources allocated on a one-time basis. At 509, the first base station 504 may transmit a resource grant to the LTE component 506 of the UE for the scheduled resources for LTE V2X transmissions. In an aspect, SPS resources may be allocated to a UE, and the first base station 504 may transmit a control message to activate or deactivate the allocated SPS resources.

At 510, LTE component 506 may communicate information to NR component 508 regarding LTE V2X transmission resources granted by first base station 504. The LTE component may communicate information about SPS process configuration or information about dynamic resources allocated for LTE V2X transmissions in a one-time grant to the NR component. In one aspect, at 514, the LTE component may communicate information regarding activation/deactivation of SPS processes for LTE V2X transmissions to the NR component.

In an aspect, if there is a possibility of collision, the first base station 504 may reselect or adjust LTE V2X transmission resources. For example, the first base station 504 may receive information on the high priority resources reserved for NR V2X transmissions, and if there is a potential conflict (e.g., a periodic conflict) between the resources used for LTE V2X transmissions and the high priority resources used for NR V2X transmissions, the first base station 504 may select new resources for LTE V2X transmissions. The first base station 504 may transmit a new SPS process configuration for LTE V2X transmissions or a new resource grant for reselected resources to the UE. At 512, the UE may communicate information regarding the reselected resources for LTE V2X to the NR component.

At 508, the NR component 508 operating in the NR V2X autonomous mode may schedule transmission resources for NR V2X communications. These resources may be reserved as one-time resources or SPS resources for NR V2X transmissions. At 518, the NR component may schedule or adjust NR V2X transmission resources to avoid collisions with LTE V2X transmission resources. For example, if there is a periodic collision between the one-time resource for NR V2X transmissions and the SPS resource for LTE V2X transmissions, the NR component may reselect the one-time resource for NR V2X transmissions. At 520, the NR component may communicate information regarding the one-time resources for NR V2X transmission to the LTE component. In an aspect, at 522, the NR component may communicate information to the LTE component regarding the reselected disposable resource for NR V2X transmission. In an aspect, at 516, the NR component may communicate information to the LTE component regarding potential conflicts between resources scheduled for NR V2X transmissions and resources scheduled for LTE V2X transmissions. In an aspect, the NR component may detect an actual collision between the NR V2X transmission and the LTE V2X transmission and may communicate information regarding the actual collision to the LTE component.

At 524, LTE component 506 may forward information regarding resources for NR V2X transmissions or information regarding potential or actual collisions to first base station 504. Alternatively, the first base station 504 and the NR component 508 may operate on asynchronous time lines. As such, information regarding the resources used for NR V2X transmissions may need to be transitioned from the NR V2X timeline to the timeline of the first base station 504. In one aspect, the first base station 504 may perform the conversion with knowledge of the NR V2X timeline. In an aspect, the LTE component may perform the conversion at 526. The LTE component may be aware of the NR V2X timeline and may convert information regarding the resources used for NR V2X transmissions from the NR V2X timeline to the timeline of the first base station 504. At 528, the LTE component may communicate the converted information regarding the resources for NR V2X transmission to base station 504. The first base station 504 may determine whether there is a collision between SPS resources for LTE V2X transmissions and high priority resources for NR V2X transmissions, and may trigger reselection of SPS resources for LTE V2X transmissions if there is a collision.

Fig. 6 is a call flow diagram 600 illustrating an implementation of an NR component 608 of a UE 602 operating in an NR V2X mode (e.g., NR mode 1) in which an NR base station 620 schedules NR V2X transmissions exchanges information about transmission resources with an LTE component 606 of the same UE operating in an LTE V2X autonomous mode (e.g., LTE mode 4). Although the example aspects are described in connection with LTE V2X communications and NR V2X communications, the aspects may also be applied to V2X, V2V, or D2D communications based on first and second RATs.

The NR base station 620 (such as a gNB) may schedule transmission resources for NR V2X communication. These resources may be dynamic resources allocated on a one-time basis or may be SPS resources. For example, at 626, NR base station 620 may transmit a resource grant for scheduled resources for NR V2X transmission to the NR component of the UE. In an aspect, for example, at 628, the NR component may process the resource grant for the NR V2X transmission. At 630, the NR component may communicate information regarding resources for NR V2X transmission to the LTE component. Although fig. 6 illustrates 626, 628, and 630 occurring at the bottom of diagram 600, these steps may occur at the top of diagram 600 (e.g., before 610).

LTE component 606 may reserve resources for LTE V2X transmissions in an SPS manner. At 610, the LTE component may communicate information regarding SPS resources for LTE V2X transmissions to the NR component. The LTE component may receive information regarding the high priority resources reserved for NR V2X transmissions (e.g., at 630) and may trigger reselection of LTE V2X transmission resources if there is a conflict between the NR V2X transmission of the high priority resources and the scheduled LTE V2X transmission resources. At 612, the LTE component may communicate information regarding reselected resources for LTE V2X transmissions to the NR component.

At 614, LTE component 606 may communicate to NR component 608 information regarding potential resources that may be selected by the LTE component for LTE V2X transmissions. These potential resources may not actually be selected for LTE V2X transmissions, but the NR base station 620 may refrain from allocating these potential resources for NR V2X transmissions to avoid collisions. In one aspect, at 616, the LTE component may communicate information regarding a priority of LTE V2X transmission packets to the NR component.

At 608, the NR component 608 may process

information

610, 612 regarding resources used for LTE V2X transmissions, information 614 regarding potential resources that may be selected by the LTE component 606 for LTE V2X transmissions, and information 616 regarding priority of LTE V2X transmission packets, and may forward some of the information regarding LTE V2X transmissions to the NR base station 620. For example, the NR component may forward information regarding the resources selected for LTE V2X transmissions to the NR base station 620 for the NR base station 620 to adjust the resources allocated for NR V2X transmissions at 624 to avoid collisions. In an aspect, the NR component may forward a certain percentage of potential resources that may be selected by the LTE component for LTE V2X transmissions to the NR base station 620 for the NR base station to avoid allocating these same resources for NR V2X transmissions. In an aspect, the NR component may periodically transmit information regarding LTE V2X transmissions to NR base station 620. In an aspect, the NR component may communicate the information if the number of potential resources that may be selected by the LTE component for LTE V2X transmissions varies by more than a configurable threshold.

Because the NR base station 620 and the LTE component 606 may operate on asynchronous timelines, information regarding resources used for LTE V2X transmissions or potential resources selectable by the LTE component for LTE V2X transmissions may need to transition from the LTE V2X timeline to the timeline of the NR base station 620. The NR component 608 may be aware of the LTE V2X timeline and may convert information regarding resources for LTE V2X transmissions from the LTE V2X transmission timeline to the timeline of the NR base station 620 at 618. At 622, the NR component may transmit the converted information regarding the resources for LTE V2X transmission to NR base station 620. At 624, the NR base station 620 may avoid allocating resources reserved for LTE V2X transmissions for NR V2X transmissions to avoid collisions. In an aspect, if there are higher priority NR packets with lower latency waiting for transmission, NR base station 620 may allocate the same resources for NR V2X transmission.

Fig. 7 is a call flow diagram 700 illustrating an implementation of the NR component 708 of a UE 702 operating in an NR V2X mode (e.g., NR mode 1) in which the NR base station 720 schedules NR V2X transmissions exchanges information about transmission resources with the LTE component 706 of the same UE operating in an LTE V2X mode (e.g., LTE mode 3) in which the LTE base station 703 schedules LTE V2X transmissions, in accordance with certain aspects of the present disclosure. Although the example aspects are described in connection with LTE V2X communications and NR V2X communications, the aspects may also be applied to V2X, V2V, or D2D communications based on first and second RATs.

NR base station 720 may schedule transmission resources (e.g., at 726) for NR V2X communications (e.g., processed at 728). LTE component 706 may communicate information (e.g., 710, 712, 714, 716) to NR component 708 regarding resources for LTE V2X transmissions. The NR component may process the information (e.g., timeline conversion at 718) and may forward some of the information regarding LTE V2X transmissions to NR base station 720 (e.g., at 722). Thus, at 724, the NR base station 720 may avoid allocating resources reserved for LTE V2X transmissions for NR V2X transmissions to avoid collisions. The operation of the LTE, NR and NR base stations 720 is similar to those discussed in fig. 6 and is not repeated for the sake of brevity.

LTE base station 703 may schedule transmission resources (e.g., at 704 and 705) for LTE V2X communication, as described above with reference to fig. 5. At 730, NR component 708 may communicate information regarding resources for NR V2X transmission to the LTE component. In an aspect, at 734, LTE component 706 may forward information regarding the resources for NR V2X transmission to LTE base station 703. Alternatively, LTE base station 703 and NR base station 720 may operate on asynchronous time lines. As such, information about resources used for NR V2X transmissions may need to be converted from the timeline of NR base station 720 to the timeline of LTE base station 703. In an aspect, the NR component may perform the conversion with its knowledge of the timeline of LTE base station 703 and may communicate the converted timeline to the LTE component. In one aspect, at 732, the LTE component may perform the conversion with knowledge of the timeline of the NR base station 720. In an aspect, LTE base station 703 may perform the transition with knowledge of the timeline of NR base station 720. After the transition, the LTE component may forward information about the timeline of NR base station 720 to LTE base station 703 at 736. The LTE base station 703 may determine whether there is a collision (e.g., a periodic collision) between SPS resources for LTE V2X transmissions and high priority resources for NR V2X transmissions, and may reconfigure the SPS process for LTE V2X transmissions if there is a collision.

Fig. 8 is a flow diagram of a method for a second RAT component of a UE to avoid a collision on a V2X transmission using a second RAT based on information received from a first RAT component of the UE regarding resources for V2X transmissions using the first RAT, in accordance with certain aspects of the present disclosure. The method may be performed by the NR components of the UE (e.g., the UE104, 350, 402, 502, 602, 702, 1350; the device 1002/1002'; the processing system 1114, which may include the memory 360 and may be the entire UE 350 or components of the UE 350 such as the TX processor 368, the RX processor 356, and/or the controller/processor 359). Dashed lines are used to illustrate optional aspects. The method improves performance of V2X transmissions using two RATs co-existing on the UE by: transmission resources for V2X transmissions using RATs with lower priorities are allocated or adjusted to avoid potential collisions between V2X transmissions using both RATs. Although the example aspects are described in connection with LTE V2X communications and NR V2X communications, the aspects may also be applied to V2X, V2V, or D2D communications based on first and second RATs.

At 802, a second RAT component of the UE may receive information from the first RAT component regarding resources for V2X transmissions using the first RAT. In one aspect, the resources may be SPS resources for V2X transmissions. In an aspect, SPS resources for V2X transmissions may be periodic. In an aspect, the resource may be a resource scheduled on a one-time-only basis (e.g., a one-time resource). In an aspect, the resource may be a reselected SPS resource for V2X transmissions determined by the first RAT component to avoid collisions between V2X transmissions using the first RAT and the second RAT. In an aspect, the resource may be a potential or candidate resource that may be selected by the first RAT component for V2X transmission. The second RAT component of the UE may receive information about the V2X transmission resources from the first RAT component using inter-stack communication.

At 804, the second RAT component may determine whether there is a potential conflict between resources for V2X transmissions using the first RAT and resources for V2X transmissions using the second RAT. For example, the second RAT component may determine whether there are one or more conflicts between SPS resources for LTE V2X transmissions using the first RAT and resources for NR V2X transmissions using the second RAT.

At 806, if there is a potential conflict between resources for V2X transmissions using the first RAT and resources for V2X transmissions using the second RAT, the second RAT component may adjust resources for V2X transmissions using the second RAT to avoid or reduce the potential conflict. The second RAT component may adjust resources for V2X transmissions using the second RAT to give priority to resources for V2X transmissions using the first RAT. For example, if there are one or more conflicts between resources for V2X transmissions using the second RAT and SPS resources for V2X transmissions using the first RAT, the second RAT component may reselect resources for V2X transmissions using the second RAT.

At 808, the second RAT component may perform a V2X transmission with the recipient UE using resources allocated for V2X transmissions using the second RAT. The resource may be a one-time resource or SPS resource used by the second RAT component to transmit one or more V2X transmission packets. In one aspect, V2X transport packets may have different levels of priority.

At 810, the second RAT component may transition information regarding resources for V2X transmissions using the first RAT from a timeline based on the first RAT to a timeline based on a base station of the second RAT. The transition may be performed by a base station of the second RAT if the base station schedules resources for transmission using V2X of the second RAT. Because the base station of the second RAT and the first RAT component may operate on asynchronous timelines, in order for the base station of the second RAT to avoid scheduling resources for V2X transmissions using the second RAT in conflict with V2X transmissions using the first RAT, information regarding resources for V2X transmissions using the first RAT may need to be placed in the timeline for the base station of the second RAT.

At 812, the second RAT component may transmit, to the base station of the second RAT, information about resources for transmission using V2X of the first RAT that has been converted to the timeline of the base station of the second RAT. The information transmitted may include: information about SPS procedures for V2X transmissions using the first RAT, information about potential resources that may be selected by the first RAT component for V2X transmissions using the first RAT, and information about priority of transmitting packets using V2X of the first RAT. In one aspect, the second RAT component may forward a certain percentage of potential resources that may be selected by the first RAT component for V2X transmissions using the first RAT to a base station of the second RAT. The base station of the second RAT may avoid allocating these same resources for V2X transmissions using the second RAT. In an aspect, the second RAT component may periodically transmit information to a base station of the second RAT regarding resources for V2X transmissions using the first RAT. In one aspect, the second RAT component may transmit this information if the number of potential resources that may be selected by the first RAT component for V2X transmissions using the first RAT varies by more than a configurable threshold.

At 814, the second RAT component may communicate information to the first RAT component regarding resources for V2X transmissions using the second RAT. In one aspect, if packets in V2X transmissions using the second RAT have high priority, strict delay requirements, or both, V2X transmissions using the second RAT may be given priority over V2X transmissions using the first RAT. Thus, the resources for V2X transmissions using the second RAT may be high priority resources. The first RAT component may receive information regarding high priority resources for V2X transmissions using the second RAT and may trigger reselection of resources for V2X transmissions using the first RAT if there is a conflict between SPS resources for V2X transmissions using the first RAT and high priority resources for V2X transmissions using the second RAT.

Fig. 9 is a flow diagram 900 of a method for a first RAT component of a UE to exchange information regarding V2X transmission resources with a second RAT component of the UE and to transmit information regarding resources for transmission using V2X of a second RAT to a base station of the first RAT in accordance with certain aspects of the present disclosure. The method may be performed by LTE components of the UE (e.g., the UE104, 350, 402, 502, 602, 702, 1350; the device 1002/1002'; the processing system 1114, which may include the memory 360 and may be the entire UE 350 or components of the UE 350 such as the TX processor 368, the RX processor 356, and/or the controller/processor 359). Optional aspects are illustrated with dashed lines. The method improves performance of V2X transmissions using two RATs co-existing on the UE by: transmission resources for V2X transmissions using RATs with lower priorities are allocated or adjusted to avoid potential collisions between V2X transmissions using both RATs. Although the example aspects are described in connection with LTE V2X communications and NR V2X communications, the aspects may also be applied to V2X, V2V, or D2D communications based on first and second RATs.

At 902, a first RAT component of a UE communicates information regarding resources for V2X transmissions using the first RAT to a second RAT component of the UE. In an aspect, the resource may be an SPS resource for V2X transmissions using the first RAT. In an aspect, SPS resources for V2X transmissions may be periodic. In an aspect, the resource may be a resource scheduled using the first RAT on a one-time-only basis (e.g., a one-time resource). In an aspect, the resource may be a reselected SPS resource determined by the first RAT component for V2X transmissions using the first RAT to avoid collisions between V2X transmissions using the first RAT and the second RAT. In an aspect, the resource may be a potential or candidate resource that may be selected by the first RAT component for V2X transmissions using the first RAT. A first RAT component of the UE may communicate information regarding V2X transmission resources using the first RAT to a second RAT component using inter-stack communication.

At 904, the first RAT component may perform a V2X transmission with the recipient UE using resources allocated for V2X transmissions using the first RAT. The resource may be an SPS resource or a one-time resource used by the first RAT component to transmit one or more V2X transmission packets. In one aspect, V2X transport packets may have different levels of priority.

At 906, the first RAT component may receive information from the second RAT component regarding resources for V2X transmissions using the second RAT. In one aspect, if packets in V2X transmissions using the second RAT have high priority, strict delay requirements, or both, V2X transmissions using the second RAT may be given priority over V2X transmissions using the first RAT. Thus, the resources for V2X transmissions using the second RAT may be high priority resources. The first RAT component may receive information regarding high priority resources for V2X transmissions using the second RAT and may trigger reselection of SPS resources for V2X transmissions using the first RAT if there is a conflict between SPS resources for V2X transmissions using the first RAT and high priority resources for V2X transmissions using the second RAT.

At 908, the first RAT component may transition information regarding resources for V2X transmissions using the second RAT from a timeline based on the second RAT to a timeline based on a base station of the first RAT. The transfer may be performed if the base station of the first RAT schedules resources for transmission using V2X of the first RAT. Because the base station of the first RAT and the second RAT component may operate on asynchronous timelines, in order for the base station of the first RAT to schedule resources for transmission using V2X of the first RAT without colliding with resources transmitted using V2X of the second RAT, information regarding resources for transmission using V2X of the second RAT may need to be placed in the timeline of the base station of the first RAT. In one aspect, resources for V2X transmissions using the second RAT may be based on a timeline of a base station of the second RAT. The first RAT component may convert information regarding resources for transmission using V2X of the second RAT from a timeline of a base station of the second RAT to a timeline of a base station of the first RAT.

At 910, the first RAT component may transmit information regarding resources for V2X transmissions using the second RAT to a base station of the first RAT. In an aspect, a first RAT component may transmit information about resources for V2X transmissions using a second RAT that has been translated to a timeline of a base station of the first RAT. In an aspect, the first RAT component may perform the transition with knowledge of the timeline of the second RAT component, such as at 908. In an aspect, the second RAT component may perform the transition with knowledge of the timeline of the base station of the first RAT. In an aspect, the first RAT component may transmit information regarding resources for V2X transmissions using the second RAT, still based on the timeline of the second RAT. If the base station of the first RAT is aware of the timeline of the second RAT, the base station of the first RAT can transition information about resources for V2X transmissions using the second RAT from the timeline of the second RAT to the timeline of the base station of the first RAT. The base station of the first RAT may determine whether there is a collision (e.g., one or more collisions) between SPS resources for V2X transmissions using the first RAT and high priority resources for V2X transmissions using the second RAT, and may reconfigure SPS procedures for V2X transmissions using the first RAT if there is a collision.

Fig. 10 is a conceptual data flow diagram 1000 illustrating the data flow between different means/components in an example apparatus 1002 according to certain aspects of the present disclosure. The device 1002 may be a UE (e.g., UE104, 350, 402, 502, 602, 702, 1002', 1350) that communicates using two RATs. The apparatus includes a receiving component 1004 that receives communications from a base station 1060 of a first RAT and a base station 1050 of a second RAT. The receiving component 1004 may also receive V2X communications from the first UE using the first RAT and V2X communications from the second UE using the second RAT. The apparatus also includes a transmission component 1022 that transmits communications to a base station 1060 of the first RAT (e.g., as described in connection with 910) and a base station 1050 of the second RAT (e.g., as described in connection with 812). For example, transmitting component 1022 may transmit information regarding transmissions using V2X of the second RAT to base station 1060 of the first RAT, and may transmit information regarding transmissions using V2X of the first RAT to base station 1050 of the second RAT. The transmission component 1022 may also transmit V2X communications using the first RAT to the first UE (e.g., as described in connection 904) and transmit V2X communications using the second RAT to the second UE (e.g., as described in connection 808).

The device 1002 includes components of a first RAT and components of a second RAT. The components of the first RAT include a first RAT autonomous transmission resource determining component 1006 configured to schedule resources for transmission using V2X of the first RAT (e.g., as described in connection with 406, 506, 606, 706). Components of the first RAT include a first RAT stack 1008 configured to receive a grant from a base station 1060 of the first RAT for resources for transmission using V2X of the first RAT. The first RAT stack 1008 may also receive resources for V2X transmissions using the first RAT from the first RAT autonomous transmission resources determining component 1006. The first RAT stack 1008 may generate information regarding resources for transmission using V2X of the first RAT and may communicate the information to a component of the second RAT, such as conflict determination component 1012 (e.g., as described in connection with 902). The components of the first RAT include a first RAT timeline translation component 1020 configured to translate information regarding resources for V2X transmissions using the second RAT from a timeline of the second RAT to a timeline of the first RAT (e.g., as described in connection with 908). The first RAT timeline conversion component 1020 may output information regarding resources for V2X transmissions using the second RAT based on a timeline of a base station 1060 of the first RAT.

The components of the second RAT include a second RAT autonomous transmission resource determining component 1010 configured to schedule resources for transmission using V2X of the second RAT (e.g., as described in connection with 408, 508, 608, 708). The components of the second RAT include a conflict determining component 1012 configured to determine whether there is a potential conflict between resources for transmissions using V2X of the first RAT and resources for transmissions using V2X of the second RAT (e.g., as described in connection with 804). Information regarding resources for V2X transmissions using the first RAT may be received from the first RAT stack 1008. Information regarding resources for transmission using V2X of the second RAT may be received from a base station 1050 of the second RAT via a grant of transmission resources for the second RAT, or may be received from the second RAT autonomous transmission resource determining component 1010. The components of the second RAT include a second RAT transmission resource adjusting component 1014 configured to adjust transmissions using the second RAT, or to change resources for V2X transmissions using the second RAT, if a potential conflict is detected by conflict determining component 1012 (e.g., as described in connection with 806).

Components of the second RAT include a second RAT stack 1016 configured to receive, from a base station 1050 of the second RAT, a grant of resources for transmission using V2X of the second RAT. The second RAT stack 1016 may also receive resources for transmission using V2X of the second RAT from the second RAT autonomous transmission resource determining component 1010. The second RAT stack 1016 may generate information regarding resources for transmission using V2X of the second RAT and may communicate the information to components of the first RAT (e.g., as described in connection with 814). The components of the second RAT include a second RAT timeline translation component 1018 configured to translate information regarding resources for V2X transmissions using the first RAT from the timeline of the first RAT to the timeline of the second RAT (e.g., as described in connection with 810). The second RAT timeline conversion component 1018 may output information regarding resources for V2X transmissions using the second RAT based on a timeline of a base station 1050 of the second RAT.

The device 1002 may include additional components to perform each block of the algorithm in the aforementioned flow diagrams of fig. 8 and 9. As such, each block in the aforementioned flow diagrams of fig. 8 and 9 may be performed by a component and the apparatus may include one or more of these components. These components may be one or more hardware components specifically configured to perform the described processes/algorithms, implemented by a processor configured to perform the described processes/algorithms, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

Fig. 11 is a diagram 1100 illustrating an example of a hardware implementation of a device 1002' employing a UE of a processing system in accordance with certain aspects of the present disclosure. The processing system 1114 may be implemented with a bus architecture, represented generally by the bus 1124. The bus 1124 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1114 and the overall design constraints. The bus 1124 links together various circuits including one or more processors and/or hardware components (represented by the processor 1104, the

components

1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020, 1022, and the computer-readable medium/memory 1106). The bus 1124 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

The processing system 1114 may be coupled to the transceiver 1110. The transceiver 1110 is coupled to one or more antennas 1120. The transceiver 1110 provides a means for communicating with various other apparatus over a transmission medium. The transceiver 1110 receives a signal from the one or more antennas 1120, extracts information from the received signal, and provides the extracted information to the processing system 1114 (and in particular the receiving component 1004). Additionally, transceiver 1110 receives information from processing system 1114 (and in particular transmission component 1022) and generates a signal to be applied to the one or more antennas 1220 based on the received information. The processing system 1114 includes a processor 1104 coupled to a computer-readable medium/memory 1106. The processor 1104 is responsible for general processing, including the execution of software stored on the computer-readable medium/memory 1106. The software, when executed by the processor 1104, causes the processing system 1114 to perform the various functions described supra for any particular apparatus. The computer-readable medium/memory 1106 may also be used for storing data that is manipulated by the processor 1104 when executing software. The processing system 1114 further includes at least one of the

components

1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020, 1022. These components may be software components running in the processor 1104, resident/stored in the computer readable medium/memory 1106, one or more hardware components coupled to the processor 1104, or some combination thereof. The processing system 1114 may be a component of the UE 350 and may include the memory 360 and/or at least one of: TX processor 368, RX processor 356, and controller/processor 359. Alternatively, the processing system 1114 may be the entire UE (e.g., see 350 of fig. 3).

In one configuration, the apparatus 1002/1002' for wireless communication includes: means for receiving, by the second RAT component from the first RAT component, information regarding resources for V2X transmissions using the first RAT (e.g., at least collision determining component 1012); means for determining whether there is a potential conflict between resources for V2X transmissions using the first RAT and resources for V2X transmissions using the second RAT (e.g., at least conflict determining component 1012); means for adjusting transmissions using the second RAT or changing resources for V2X transmissions using the second RAT (e.g., at least a second RAT transmission resource adjusting component 1014); means for transmitting (e.g., at least transmitting component 1022) the V2X packet carried in the resources for V2X transmissions using the second RAT; means for converting information regarding resources for transmission using V2X of the first RAT from a timeline of the first RAT to a timeline of a second RAT (e.g., at least second RAT timeline converting component 1018); means for transmitting (e.g., at least transmitting component 1022) information to a base station of a second RAT regarding resources for transmission using V2X of the first RAT; means for communicating information about using V2X transmission resources of the second RAT (e.g., at least the second RAT stack 1016) from the second RAT component to the first RAT component.

In one configuration, an apparatus 1002' for wireless communication comprises: means for communicating information about resources for V2X transmissions using the first RAT from the first RAT component to the second RAT component (e.g., at least a first RAT stack 1008); means for transmitting V2X packets carried in resources for V2X transmissions using the first RAT (e.g., at least transmitting component 1022); means for receiving, by the first RAT component from the second RAT component, information regarding use of V2X transmission resources of the second RAT (e.g., at least first RAT timeline translation component 1020); means for converting information regarding resources for transmission using V2X of the second RAT from a timeline of the second RAT to a timeline of the first RAT (e.g., at least a first RAT timeline converting component 1020); means for transmitting (e.g., at least transmitting component 1022) information to a base station of a first RAT regarding resources for transmission using V2X of a second RAT.

The aforementioned means may be one or more of the aforementioned components of apparatus 1002 and/or the aforementioned components of processing system 1114 of apparatus 1002' configured to perform the functions recited by the aforementioned means. As described supra, the processing system 1114 may include the TX processor 368, the RX processor 356, and the controller/processor 359. As such, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.

Fig. 12 is a flow diagram 1200 of a method for a base station of a first RAT to receive information from a UE regarding resources reserved for V2X transmissions from the UE using a second RAT to determine resources for V2X transmissions from the UE using the first RAT, in accordance with certain aspects of the present disclosure. The method may be performed by an LTE base station (e.g., eNB,

base stations

102, 310, 504, 703, 1060, device 1302/1302'; processing system 1414, which may include memory 376 and may be the entire base station 310 or a component of the base station 310, such as TX processor 316, RX processor 370, and/or controller/processor 375). In this scenario, the first RAT may be LTE and the second RAT may be NR. Alternatively, the method may be performed by an NR base station (e.g., gNB,

base stations

102, 310, 620, 720, 1050, device 1302/1302'; processing system 1414, which may include memory 376 and may be the entire base station 310 or a component of the base station 310, such as TX processor 316, RX processor 370, and/or controller/processor 375). In this scenario, the first RAT may be NR and the second RAT may be LTE. Dashed lines are used to illustrate optional aspects. The method improves performance of V2X transmissions using two RATs co-existing on the UE by: transmission resources for V2X transmissions using RATs with lower priorities are allocated or adjusted to avoid potential collisions between V2X transmissions using both RATs. Although the example aspects are described in connection with LTE V2X communications and NR V2X communications, the aspects may also be applied to V2X, V2V, or D2D communications based on first and second RATs.

At 1202, a base station of a first RAT may receive information from a first RAT component of a UE regarding a second resource reserved for V2X transmissions using a second RAT. In an aspect, the information may be information about resources for V2X transmissions using a second RAT that have been translated to a timeline for a base station of the first RAT. In an aspect, the information may be information about resources for V2X transmissions using the second RAT still based on the timeline of the second RAT.

At 1204, the base station of the first RAT may convert information regarding the second resources reserved for V2X transmissions using the second RAT from a timeline of the second RAT to a timeline of the first RAT. For example, if a base station of a first RAT is aware of the timeline of a second RAT, the base station of the first RAT may transition information regarding resources for transmission using V2X of the second RAT from the timeline of the second RAT to the timeline of the base station of the first RAT.

At 1206, the base station of the first RAT may determine first resources for V2X transmissions using the first RAT to avoid colliding with second resources reserved for V2X transmissions using the second RAT. For example, a base station of a first RAT may determine whether there are conflicts (e.g., one or more conflicts) between SPS resources for V2X transmissions using the first RAT and high priority resources for V2X transmissions using a second RAT, and may reconfigure an SPS process for V2X transmissions using the first RAT if there are conflicts.

At 1208, the base station of the first RAT may transmit information to a first RAT component of the UE regarding the first resources for V2X transmissions using the first RAT. For example, a base station of a first RAT may transmit a resource grant for scheduled resources for V2X transmissions to a first RAT component of the UE. The resources may be SPS resources used by the first RAT component to transmit one or more V2X transmission packets or dynamic resources allocated on a one-time basis. A first RAT component of the UE may perform a V2X transmission with the recipient UE using resources allocated for V2X transmissions using the first RAT.

Fig. 13 is a conceptual data flow diagram 1300 illustrating the data flow between different means/components in an example apparatus 1302 according to certain aspects of the present disclosure. The device 1302 may be a base station of a first RAT, such as an LTE base station (e.g., eNB,

base stations

102, 310, 504, 703, 1060, device 1302/1302'). Alternatively, device 1302 can be a base station, such as an NR base station (e.g., a gNB,

base stations

102, 310, 620, 720, 1050, device 1302/1302'). The apparatus includes a receiving component 1304 that receives uplink communications from a UE 1350; and a transmitting component 1306 that transmits downlink communications to UE 1350. The receiving component 1304 may be configured to receive information from a first RAT component of the UE 1350 regarding resources for V2X transmissions using a second RAT (e.g., as described in connection with 1202). The transmitting component 1306 may be configured to transmit, to a first RAT component of the UE 1350, a grant of resources for transmission using V2X of the first RAT (e.g., as described in connection with 1208). The first RAT component of the UE 1350 may perform V2X with the recipient UE using resources granted for V2X transmissions using the first RAT.

The apparatus 1302 may include a timeline conversion component 1308 configured to convert information regarding resources for transmission using V2X of a second RAT from a timeline of the second RAT to a timeline of the first RAT (e.g., as described in connection with 1204). The timeline conversion component 1308 may output information regarding resources for V2X transmissions using the second RAT based on the timeline of the device 1302. The apparatus 1302 includes a transmission resource determining component 1310 configured to determine or adjust resources for V2X transmissions using a first RAT to avoid collision with resources for V2X transmissions using a second RAT (e.g., as described in connection with 1206). Transmission resource determining component 1310 may generate a grant of resources for transmission using V2X of the first RAT for transmitting component 1306 to the first RAT component of UE 1350.

The device 1302 may include additional components that perform each block of the algorithm in the aforementioned flow chart of fig. 12. As such, each block in the aforementioned flow diagram of fig. 12 may be performed by a component and the apparatus may include one or more of those components. These components may be one or more hardware components specifically configured to perform the described processes/algorithms, implemented by a processor configured to perform the described processes/algorithms, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

Fig. 14 is a diagram 1400 illustrating an example of a hardware implementation of an apparatus 1302' of a base station employing a processing system 1414, in accordance with certain aspects of the present disclosure. The processing system 1414 may be implemented with a bus architecture, represented generally by the bus 1424. The bus 1424 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1414 and the overall design constraints. The bus 1424 links together various circuits including one or more processors and/or hardware components (represented by the processor 1104, the

components

1304, 1306, 1308, 1310, and the computer-readable medium/memory 1406). The bus 1424 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

The processing system 1414 can be coupled to the transceiver 1410. The transceiver 1410 is coupled to one or more antennas 1420. The transceiver 1410 provides a means for communicating with various other apparatus over a transmission medium. The transceiver 1410 receives signals from the one or more antennas 1420, extracts information from the received signals, and provides the extracted information to the processing system 1414, and in particular the receiving component 1304. Further, transceiver 1410 receives information from processing system 1414 (specifically transmission component 1306) and generates a signal to be applied to the one or more antennas 1420 based on the received information. The processing system 1414 includes a processor 1404 coupled to a computer-readable medium/memory 1406. The processor 1404 is responsible for general processing, including the execution of software stored on the computer-readable medium/memory 1406. The software, when executed by the processor 1404, causes the processing system 1414 to perform the various functions described supra for any particular apparatus. The computer-readable medium/memory 1406 may also be used for storing data that is manipulated by the processor 1404 when executing software. Processing system 1414 further includes at least one of

components

1304, 1306, 1308, 1310. These components may be software components running in the processor 1404, resident/stored in the computer readable medium/memory 1406, one or more hardware components coupled to the processor 1404, or some combination thereof. The processing system 1414 can be a component of the base station 310 and can include the memory 376 and/or at least one of the following: TX processor 316, RX processor 370, and controller/processor 375. Alternatively, processing system 1414 can be the entire base station (e.g., see 310 of fig. 3).

In one configuration, the apparatus 1302' for wireless communication includes: means for receiving information from a first RAT component of the UE regarding resources for V2X transmissions using a second RAT (e.g., at least receiving component 1304); means for converting information regarding resources for transmission using V2X of the second RAT from a timeline of the second RAT to a timeline of the first RAT (e.g., at least timeline converting component 1308); means for determining or adjusting resources for V2X transmissions using a first RAT to avoid collision with resources for V2X transmissions using a second RAT (e.g., at least transmission resource determining component 1310); means for transmitting (e.g., at least transmitting component 1306) a grant to a first RAT component of the UE for resources for transmission using V2X of the first RAT.

The aforementioned means may be one or more of the aforementioned components of apparatus 1302 and/or the aforementioned components of processing system 1414 of apparatus 1302' configured to perform the functions recited by the aforementioned means. As described supra, the processing system 1414 may include the TX processor 316, the RX processor 370, and the controller/processor 375. As such, in one configuration, the aforementioned means may be the TX processor 316, the RX processor 370, and the controller/processor 375 configured to perform the functions recited by the aforementioned means.

It should be understood that the specific order or hierarchy of blocks in the processes/flow diagrams disclosed is an illustration of exemplary approaches. It will be appreciated that the specific order or hierarchy of blocks in the processes/flow diagrams may be rearranged based on design preferences. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The following examples are illustrative only, and may be combined with aspects of other embodiments or teachings described herein without limitation.

Example 1 is a method of wireless communication at a UE having a first RAT component for communicating using a first RAT and a second RAT component for communicating using a second RAT, the method comprising: receiving, by a second RAT component of the UE, information from a first RAT component of the UE regarding a first resource for a first transmission using a first RAT; determining, by the second RAT component, whether there is a potential conflict between a first resource for a first transmission using the first RAT and a second resource for a second transmission using the second RAT; adjusting the second transmission or changing the second resource in response to determining the potential collision; and transmitting at least one of the first transmission using the first RAT or the second transmission using the second RAT to the receiving UE.

In example 2, the method of example 1 further comprises: the information about the first resource includes timing information for a first transmission using the first RAT.

In example 3, the method of example 1 or 2 further comprises: determining the potential conflict includes determining that a first timing of a first transmission using the first RAT at least partially overlaps in time with a second timing of a second transmission using the second RAT.

In example 4, the method of any of examples 1-3 further comprising: the information about the first resource includes an SPS reservation using the first RAT.

In example 5, the method of any of examples 1-4 further comprises: the information about the first resources includes a plurality of potential resources that can be reserved for a first transmission using the first RAT.

In example 6, the method of any of examples 1-5, further comprising: avoiding, by the second RAT component, the plurality of potential resources for a second resource for a second transmission using the second RAT, the second RAT component changing the second resource in response to the potential conflict.

In example 7, the method of any of examples 1-6 further comprising: information regarding the first resource is received by a first RAT component of the UE from a base station of the first RAT.

In example 8, the method of any one of examples 1-7 further includes: the first RAT comprises LTE and the second RAT comprises NR.

In example 9, the method of any one of examples 1-8 further comprising: transmitting, by a second RAT component of the UE, information regarding at least a portion of the first resources for a first transmission using the first RAT to a base station of a second RAT.

In example 10, the method of any of examples 1-9, further comprising: the UE transmits the information to a base station of a second RAT in response to a grant from the first RAT or a resource reselection by the first RAT component.

In example 11, the method of any of examples 1-10, further comprising: the UE indicates a priority of a first transmission using a first RAT to a base station of a second RAT.

In example 12, the method of any of examples 1-11 further comprising: the information about the first resource includes timing information for a first transmission on the first RAT, and wherein the first timing of the first transmission using the first RAT occurs in a pattern over a period of time.

In example 13, the method of any of examples 1-12 further comprising: the information about the first resources includes a plurality of potential resources that can be reserved for a first transmission using the first RAT.

In example 14, the method of any one of examples 1-13 further comprising: the second RAT component converts information regarding a first resource for a first transmission using the first RAT from a first timeline based on the first RAT to a second timeline based on the second RAT, wherein the second RAT component of the UE transmits information regarding the first resource to a base station of the second RAT after converting the information to the second timeline based on the second RAT.

In example 15, the method of any of examples 1-14 further comprising: transmitting, by a second RAT component of the UE, information to a first RAT component of the UE regarding a third resource for using a semi-persistent scheduling (SPS) reservation of the second RAT.

In example 16, the method of any of examples 1-15 further comprising: changing, by a first RAT component of the UE, the first resource in response to detecting an overlap in time between the first resource and the third resource.

In example 17, the method of any of examples 1-16 further comprising: transmitting, by a first RAT component of the UE, information to a base station of the first RAT regarding a third resource for using SPS reservations of the second RAT.

In example 18, the method of any one of examples 1-17 further comprising: transitioning, by a first RAT component of a UE, information regarding third resources for an SPS reservation using a second RAT from a first timeline based on the second RAT to a second timeline based on the first RAT, wherein the first RAT component of the UE transmits the third resources for the SPS reservation to a base station of the first RAT after transitioning the third resources for the SPS reservation to the second timeline based on the first RAT.

In example 19, the method of any one of examples 1-18, further comprising: transitioning, by a second RAT component of the UE, information regarding third resources for SPS reservation using a second RAT from a first timeline based on the second RAT to a second timeline based on the first RAT, and wherein the first RAT component of the UE transmits the third resources for the SPS reservation to a base station of the first RAT after transitioning, by the second RAT component of the UE, the third resources for the SPS reservation to the second timeline based on the first RAT.

Example 20 is an apparatus comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause a system or apparatus to implement a method as in any of examples 1-19.

Example 21 is a system or device comprising means for implementing a method or device as in any of examples 1-19.

Example 22 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement a method as in any one of examples 1-19.

Example 23 is a method for wireless communication at a base station of a first RAT, the base station scheduling first resources for a first transmission by a User Equipment (UE) using the first RAT, the method comprising: receiving, from the UE, information regarding second resources reserved for a second transmission from the UE to a recipient UE on a second RAT; determining first resources for a first transmission using a first RAT to avoid using second resources reserved for a second transmission using a second RAT; and transmitting information about the first resource to the UE.

In example 24, the method of example 23 further comprising: the information on the first resources includes first timing information for a first transmission using the first RAT.

In example 25, the method of any one of examples 23 or 24 further comprising: the information about the first resource includes an SPS reservation using the first RAT.

In example 26, the method of any one of examples 23-25, further comprising: the information on the second resource includes second timing information for a second transmission using the second RAT.

In example 27, the method of any of examples 23-26 further comprising: the information on the second resource includes an SPS reservation using the second RAT.

In example 28, the method of any of examples 23-27, further comprising: the information about the second resources includes a plurality of potential resources that can be reserved for a second transmission on the second RAT.

In example 29, the method of any of examples 23-28 further comprising: information regarding the second resources is converted from a second RAT timeline based on the second RAT to a first RAT timeline based on the first RAT to avoid using second resources reserved for a second transmission using the second RAT.

Example 30 is an apparatus comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause a system or apparatus to implement a method as in any of examples 23-29.

Example 31 is a system or device comprising means for implementing a method or device as in any of examples 23-29.

Example 32 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement a method as in any one of examples 23-29.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration. Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. The term "some" or "an" refers to one or more, unless specifically stated otherwise. Combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" include any combination of A, B and/or C, and may include a plurality of a, B or C. In particular, combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" may be a only, B only, C, A only and B, A and C, B and C, or a and B and C, wherein any such combination may contain one or more members of A, B or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The terms "module," mechanism, "" element, "" device, "and the like may not be a substitute for the term" means. As such, no claim element should be construed as a means-plus-function unless the element is explicitly recited using the phrase "means for …".

Claims

1. A method of wireless communication at a User Equipment (UE) having a first Radio Access Technology (RAT) component for communicating using a first RAT and a second RAT component for communicating using a second RAT, the method comprising:

receiving, by the second RAT component of the UE, information from the first RAT component of the UE regarding a first resource for a first transmission using the first RAT;

determining, by the second RAT component, whether there is a potential conflict between the first resource for the first transmission using the first RAT and a second resource for a second transmission using the second RAT;

adjusting the second transmission or changing the second resources in response to determining the potential collision; and

transmitting, to a recipient UE, at least one of the first transmission using the first RAT or the second transmission using the second RAT.

2. The method of claim 1, wherein the first RAT comprises Long Term Evolution (LTE) and the second RAT comprises a New Radio (NR).

3. The method of claim 1, wherein the information about the first resource comprises timing information for the first transmission using the first RAT.

4. The method of claim 3, wherein determining the potential conflict comprises: determining that a first timing of the first transmission using the first RAT at least partially overlaps in time with a second timing of the second transmission using the second RAT.

5. The method of claim 3, wherein the information about the first resource comprises a semi-persistent scheduling (SPS) reservation using the first RAT.

6. The method of claim 1, wherein the information about the first resource comprises a plurality of potential resources that can be reserved for the first transmission using the first RAT.

7. The method of claim 6, wherein changing the second resource in response to the potential conflict comprises: refraining, by the second RAT component of the UE, from using the plurality of potential resources for the second resource for the second transmission using the second RAT.

8. The method of claim 1, further comprising:

receiving, by the first RAT component of the UE, information about the first resource from a base station of the first RAT.

9. The method of claim 1, further comprising:

transmitting, by the second RAT component of the UE, information regarding at least a portion of the first resources for the first transmission using the first RAT to a base station of the second RAT.

10. The method of claim 9, wherein the UE transmits the information to a base station of the second RAT in response to a grant from the first RAT or a resource reselection by the first RAT component.

11. The method of claim 9, wherein the UE indicates a priority of the first transmission using the first RAT to a base station of the second RAT.

12. The method of claim 9, wherein the information regarding the first resources comprises timing information for the first transmission on the first RAT, and wherein first timing of the first transmission using the first RAT occurs in a pattern over a period of time.

13. The method of claim 9, wherein the information about the first resource comprises a plurality of potential resources that can be reserved for the first transmission using the first RAT.

14. The method of claim 9, further comprising:

transitioning information regarding the first resources for the first transmission using the first RAT from a first timeline based on the first RAT to a second timeline based on the second RAT, and wherein the second RAT component of the UE transmits information regarding the first resources to a base station of the second RAT after transitioning information regarding the first resources to the second timeline based on the second RAT.

15. The method of claim 1, further comprising:

transmitting, by the second RAT component of the UE to the first RAT component of the UE, information about a third resource for using a semi-persistent scheduling (SPS) reservation of the second RAT.

16. The method of claim 15, further comprising:

changing, by the first RAT component of the UE, the first resource in response to detecting an overlap in time between the first resource and the third resource.

17. The method of claim 15, further comprising:

transmitting, by the first RAT component of the UE, information to a base station of the first RAT regarding the third resource for using the SPS reservation of the second RAT.

18. The method of claim 17, further comprising:

transitioning, by the first RAT component of the UE, information regarding the third resources for the SPS reservations using the second RAT from a first timeline based on the second RAT to a second timeline based on the first RAT, and wherein the first RAT component of the UE transmits the third resources for the SPS reservations to a base station of the first RAT after transitioning the third resources for the SPS reservations to the second timeline based on the first RAT.

19. The method of claim 17, further comprising:

transitioning, by the second RAT component of the UE, information regarding the third resources for the SPS reservation using the second RAT from a first timeline based on the second RAT to a second timeline based on the first RAT, and wherein the first RAT component of the UE transmits the third resources for the SPS reservation to a base station of the first RAT after transitioning, by the second RAT component of the UE, the third resources for the SPS reservation to the second timeline based on the first RAT.

20. An apparatus of wireless communication at a User Equipment (UE) having a first Radio Access Technology (RAT) component for communicating using a first RAT and a second RAT component for communicating using a second RAT, the apparatus comprising:

a memory; and

at least one processor coupled to the memory and configured to:

21. The apparatus of claim 20, wherein the at least one processor is further configured to:

22. The apparatus of claim 20, wherein the at least one processor is further configured to:

23. A method for wireless communication at a base station of a first Radio Access Technology (RAT), the base station scheduling first resources for a first transmission by a User Equipment (UE) using the first RAT, the method comprising:

receiving, from the UE, information regarding second resources reserved for a second transmission from the UE to a recipient UE on a second RAT;

determining the first resources for the first transmission using the first RAT to avoid using the second resources reserved for the second transmission using the second RAT; and

transmitting resource information regarding the first resource to the UE.

24. The method of claim 23, wherein the resource information regarding the first resource comprises first timing information for the first transmission using the first RAT.

25. The method of claim 24, wherein the resource information regarding the first resource comprises a semi-persistent scheduling (SPS) reservation using the first RAT.

26. The method of claim 23, wherein the information regarding the second resources comprises second timing information for the second transmission using the second RAT.

27. The method of claim 26, wherein the information about the second resource comprises a semi-persistent scheduling (SPS) reservation using the second RAT.

28. The method of claim 23, wherein the information regarding the second resources comprises a plurality of potential resources that can be reserved for the second transmission on the second RAT.

29. The method of claim 23, further comprising:

transitioning information regarding the second resources from a second RAT timeline based on the second RAT to a first RAT timeline based on the first RAT to avoid using the second resources reserved for the second transmission using the second RAT.

30. An apparatus for wireless communication at a base station of a first Radio Access Technology (RAT), the base station scheduling first resources for a first transmission by a User Equipment (UE) using the first RAT, the apparatus comprising:

a memory; and

at least one processor coupled to the memory and configured to:

transmitting information about the first resource to the UE.